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What's on the worksheet
- Find x and the angles, and decide whether the quadrilateral must be a parallelogram or a rectangle.
- Decide whether a parallelogram must be a rectangle, a rhombus, a square or neither.
- Explain why the floor from two crossing tent poles is a rectangle.
- Work out the shape of a car jack made of four equal arms.
- Test Jae-won's claim with a parallelogram on coordinates.
- Prove a parallelogram is a rhombus from equal segments from a vertex.
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The free lesson teaches it with worked examples and practice problems.
Proving a parallelogram is a rectangle or a rhombus: the lesson ›More Chapter 6 worksheets: Quadrilaterals and polygons
- 6.1Angle sums of polygons
- 6.2Regular polygons and their angles
- 6.3Tessellations
- 6.4Properties of a parallelogram
- 6.5Proving properties of a parallelogram
- 6.6Proving a quadrilateral is a parallelogram
- 6.7Rectangles, rhombuses and squares
- 6.8Proving a parallelogram is a rectangle or a rhombus
- 6.9Trapezoids and kites
- 6.10Proving properties of an isosceles trapezoid
- 6.11Midsegments of triangles and trapezoids
- 6.12The quadrilateral family tree